Correlation Between Thermodynamic and Surface Properties of Liquid Ag-Cu and Cd-Ga Binary Alloys

Abstract

The mixing behaviour in Ag-Cu and Cd-Ga liquid alloys has been studied
through the concentration dependent thermodynamic (free energy of
mixing, entropy of mixing and enthalpy of mixing) as well as the
microscopic functions (concentration–concentration fluctuations in longwavelength limit and chemical short range order parameter), transport
(chemical diffusion) and surface properties (surface concentration and
surface tension) using the self-association model (SAM). The results
obtained are in good agreement with the available experimental data on
pure elements and their alloys. In addition, the results indicated that AgCu and Cd-Ga alloys are segregated systems with preference for like
atoms to pair as nearest neighbours in both liquid Ag-Cu and Cd-Ga
alloys. The contrasting behaviours exhibited by the two liquid alloys both
in the bulk and surface properties were correlated to the roles of the
entropic and enthalpic effects on the mixing properties.